diff options
| author | Markos Chandras <markos.chandras@imgtec.com> | 2015-08-13 07:56:32 (GMT) |
|---|---|---|
| committer | Ralf Baechle <ralf@linux-mips.org> | 2015-09-03 10:08:13 (GMT) |
| commit | 83d43305a1df2aa2976e3ccf012e4cf0dc29673d (patch) | |
| tree | 0cb65c74cbe19e526aff633130e253355bcc3ce9 /arch/mips/math-emu/cp1emu.c | |
| parent | e24c3bec3e8e254a3784b3e4c97bd3a76fbcc807 (diff) | |
| download | linux-83d43305a1df2aa2976e3ccf012e4cf0dc29673d.tar.xz | |
MIPS: math-emu: Add support for the MIPS R6 MSUBF FPU instruction
MIPS R6 introduced the following instruction:
Floating Point Fused Multiply Subtract:
MSUBF.fmt To perform a fused multiply-subtract of FP values.
MSUBF.fmt: FPR[fd] = FPR[fd] - (FPR[fs] x FPR[ft])
Signed-off-by: Markos Chandras <markos.chandras@imgtec.com>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/10957/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Diffstat (limited to 'arch/mips/math-emu/cp1emu.c')
| -rw-r--r-- | arch/mips/math-emu/cp1emu.c | 26 |
1 files changed, 26 insertions, 0 deletions
diff --git a/arch/mips/math-emu/cp1emu.c b/arch/mips/math-emu/cp1emu.c index 67390ec..54964b3 100644 --- a/arch/mips/math-emu/cp1emu.c +++ b/arch/mips/math-emu/cp1emu.c @@ -1778,6 +1778,19 @@ static int fpu_emu(struct pt_regs *xcp, struct mips_fpu_struct *ctx, break; } + case fmsubf_op: { + union ieee754sp ft, fs, fd; + + if (!cpu_has_mips_r6) + return SIGILL; + + SPFROMREG(ft, MIPSInst_FT(ir)); + SPFROMREG(fs, MIPSInst_FS(ir)); + SPFROMREG(fd, MIPSInst_FD(ir)); + rv.s = ieee754sp_msubf(fd, fs, ft); + break; + } + case fabs_op: handler.u = ieee754sp_abs; goto scopuop; @@ -2011,6 +2024,19 @@ copcsr: break; } + case fmsubf_op: { + union ieee754dp ft, fs, fd; + + if (!cpu_has_mips_r6) + return SIGILL; + + DPFROMREG(ft, MIPSInst_FT(ir)); + DPFROMREG(fs, MIPSInst_FS(ir)); + DPFROMREG(fd, MIPSInst_FD(ir)); + rv.d = ieee754dp_msubf(fd, fs, ft); + break; + } + case fabs_op: handler.u = ieee754dp_abs; goto dcopuop; |